我写了一个自定义列表视图以及搜索功能。代码如下：
public class FaqActivity extends AppCompatActivity {
ListView listView;
ListViewAdapter adapter;
String[] title;
int[] icon;
ArrayList<faqmodellist> arrayList = new ArrayList<>();
private final String TAG = FaqActivity.class.getCanonicalName();
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.faq_layout);
listView = findViewById(R.id.list_item);
Toolbar toolbar = findViewById(R.id.toolbar);
toolbar.setNavigationIcon(R.drawable.ic_n_back);
setSupportActionBar(toolbar);
title = new String[]{
"Battery",
"Cpu",
"Display",
"Memory",
"Sensor"
};
icon = new int[]{R.drawable.ic_n_help};
listView = findViewById(R.id.listView);
for (int i = 0; i < title.length; i++) {
faqmodellist model = new faqmodellist(title[i], icon[i]);
Log.i(TAG, "onCreate: array is" + Arrays.toString(icon));
//bind all strings in an array
arrayList.add(model);
}
//pass results to listViewAdapter class
adapter = new ListViewAdapter(this, arrayList);
//bind the adapter to the listview
listView.setAdapter(adapter);
}
@Override
public boolean onCreatePanelMenu(int featureId, Menu menu) {
getMenuInflater().inflate(R.menu.menu, menu);
MenuItem myActionMenuItem = menu.findItem(R.id.appSearchBar);
final SearchView searchView = (SearchView) myActionMenuItem.getActionView();
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String s) {
return false;
}
@Override
public boolean onQueryTextChange(String s) {
if (TextUtils.isEmpty(s)) {
adapter.filter("");
listView.clearTextFilter();
} else {
adapter.filter(s);
}
return true;
}
});
return true;
}
}
Custom listview adapter:
public class ListViewAdapter extends BaseAdapter {
private Context mContext;
private LayoutInflater inflater;
private List<faqmodellist> modellist;
private ArrayList<faqmodellist> arrayList;
public ListViewAdapter(Context context, List<faqmodellist> modellist) {
mContext = context;
this.modellist = modellist;
inflater = LayoutInflater.from(mContext);
this.arrayList = new ArrayList<>();
this.arrayList.addAll(modellist);
}
public static class ViewHolder{
TextView mTitleTv;
ImageView mIconIv;
}
@Override
public int getCount() {
return modellist.size();
}
@Override
public Object getItem(int i) {
return modellist.get(i);
}
@Override
public long getItemId(int i) {
return i;
}
@Override
public View getView(final int position, View view, ViewGroup parent) {
ViewHolder holder;
if (view==null){
holder = new ViewHolder();
view = inflater.inflate(R.layout.item_listview, parent);
//locate the views in row.xml
holder.mTitleTv = view.findViewById(R.id.mainTitle);
holder.mIconIv = view.findViewById(R.id.mainIcon);
view.setTag(holder);
}
else {
holder = (ViewHolder)view.getTag();
}
//set the results into textviews
holder.mTitleTv.setText(modellist.get(position).getTitle());
//set the result in imageview
holder.mIconIv.setImageResource(modellist.get(position).getIcon());
//listview item clicks
view.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (modellist.get(position).getTitle().equals("Battery")){
//start FaqAnswersActivity with title for actionbar and text for textview
Intent intent = new Intent(mContext, FaqAnswersActivity.class);
intent.putExtra("actionBarTitle", "Battery");
intent.putExtra("contentTv", "This is Battery detail...");
mContext.startActivity(intent);
}
if (modellist.get(position).getTitle().equals("Cpu")){
//start FaqAnswersActivity with title for actionbar and text for textview
Intent intent = new Intent(mContext, FaqAnswersActivity.class);
intent.putExtra("actionBarTitle", "Cpu");
intent.putExtra("contentTv", "This is Cpu detail...");
mContext.startActivity(intent);
}
if (modellist.get(position).getTitle().equals("Display")){
//start FaqAnswersActivity with title for actionbar and text for textview
Intent intent = new Intent(mContext, FaqAnswersActivity.class);
intent.putExtra("actionBarTitle", "Display");
intent.putExtra("contentTv", "This is Display detail...");
mContext.startActivity(intent);
}
if (modellist.get(position).getTitle().equals("Memory")){
//start FaqAnswersActivity with title for actionbar and text for textview
Intent intent = new Intent(mContext, FaqAnswersActivity.class);
intent.putExtra("actionBarTitle", "Memory");
intent.putExtra("contentTv", "This is Memory detail...");
mContext.startActivity(intent);
}
if (modellist.get(position).getTitle().equals("Sensor")){
//start FaqAnswersActivity with title for actionbar and text for textview
Intent intent = new Intent(mContext, FaqAnswersActivity.class);
intent.putExtra("actionBarTitle", "Sensor");
intent.putExtra("contentTv", "This is Sensor detail...");
mContext.startActivity(intent);
}
}
});
return view;
}
//filter
public void filter(String charText){
charText = charText.toLowerCase(Locale.getDefault());
modellist.clear();
if (charText.length()==0){
modellist.addAll(arrayList);
}
else {
for (faqmodellist model : arrayList){
if (model.getTitle().toLowerCase(Locale.getDefault()).contains(charText)){
modellist.add(model);
}
}
}
notifyDataSetChanged();
}
}
当我运行该代码时，出现此错误：
由： java.lang.ArrayIndexOutOfBoundsException： length=1; index=1 at com.dell.helpmodule.screen.ui.activity.FaqActivity.onCreate(FaqActivity.java：52(at android.app.Activity.performCreate(Activity.java：7893(at android.app.Activity.performCreate(Activity.java：
7880(at android.app.Instrumentation.callActivityOnCreate(
Instrumentation.java：1307(
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java：3279(
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java：3443( at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java：83( at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java：
135( at android
.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java：95(
at android.app.ActivityThread$H.handleMessage(ActivityThread.java：2040(
at android.os.Handler.dispatchMessage(Handler.java：107( at android.os.Looper.loop(Looper.java：224( at android.app.ActivityThread.main(ActivityThread.java：7520( at java.lang.reflect.Method.invoke(Native Method( at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java：539( at com.android.internal.os.ZygoteInit.main(ZygoteInit.java：950(
图像数组中只有一个元素，数组从位置 0 开始。如何修复该错误？
图标数组中只有 1 个项目。 如果要向所有FAQModelList项添加相同的图标，则应将for循环中的模型初始化替换为：
faqmodellist model = new faqmodellist(title[i], R.drawable.ic_n_help);